Pump



Dec. 15, 1925- 4 L. B. GREEN P-UMP Filed March 6, 1924 a sheets-sheet 1Dec-15,1925- 1.565.640

' L. B. GR EEN' F'UMP Filed March a, 1924 6 SheetsSheet s a i/a.%m/

Patented Dec. 15, 1925.

"UNITED STATES PATENT or fice.

Lana. GREEN, or LAKEWOOD, onIo, assronon or ONE-Tami) no amt. JONES, orCLEVELAND, OHIO, AND onnr'rnmn 'ro cassxos 1.. rm, or omen, 01:10,

am) onn-rnian T connan n. xnausn, or cnnvmm, omo.

. Pour.

Application filed March 6, 1924. Serial No. 687,284.

T 0 all whom it may concern:

Be-it known that I, Lnn B. GREEN, a citizen of the United'States, and aresident of Lakewood, county of Cuyahoga, State of Ohio, have inventedcertain new and useful Improvements in Pumps, of which the following isa specification.

This invention relates to pumps and more particularly to pumps forcompressing gases 1n refrigerating apparatus. \Vhile the inventionrelates generally to pumps for re frigerating apparatus yet it hasreference also to pumps especially adapted for use in connectionwithportable drinking-water -5 coolers for oflices and other places wherethe same are .used.

It is one of the objects of the invention to provide a pump of thevalveless type that it will be quiet in o eration, simple in con- !0'struction and so esigned that the parts thereof may be manufactured ata minimum cost by modern production methods.

It is a further object of the invention to provide a pump especiallyadapted to act 35 as a. com ressor for the refrigerating fluid withoutliability of pumping objectionable quantities oflubricant into thecooling system.

A further object of the invention is to 0 provide a construction inwhich the working partsare submerged in a lubricantwhich will not onlydecrease the wear to a minimum but will also insure quiet-running and athoroughly effective seal against leakage r of the refrigerant.

Other objects of the invention and the features of novelty will beapparent from ,the following description, taken in connection with theaccompanying drawings, of .0 which:

Figure 1 is a central longitudinal section through a )ump embodying niyinvention,

the section eing on vthe'line 1 1 of Fig. 2; Fig. 2 is a horizontalsection on the line 6 2-2 of Fig.1;.

. Fig. 3 is a vertical section on the line 3 3 of Fig. 2; and

"Fig. 4 is an elevation of one side of the Pump 0 Referring to thedrawmgs, indicates a hollow base casting, open at the top and havingsecured thereon, by the bolts 11, a casing comprising the sections 12,13 and 14 which are providedwith suitable flanges and secured togetherby bolts 15. The base 55 10 has a horizontal partition 16 near thebottom thereof in whichthere isa vertical bearing 17, the lower end. ofwhich is closed by' the wall 18 so that "the partition 16 forms thebottom of the chamber in the base 10, and this bottom is entirely closedso that there is no possibility of leakage of lubricant therethrough.The section 12 of the casing, which is supported on the base 10, has aconical bottom wall 19 and an internal upwardly proectmg boss 20 whichprovides a s ace 21 for a lubricant, as will be hereina ter describedmore in detail. The bottom wall 19 may be other than of conical form but70 1 prefer the form illustrated because it facilitates manufacture ofthe section 12 and yet provides the requisite space 21. A boss 22projects downwardly from the wall 19, in alignment with the boss 20andwith the bearing 17. A suitable bushing 23 is arranged in the boss 20and has a horizontally extending flange 24 at its upper end. The bushing23 acts as a bearing for the vertical crankshaft 25, the lower end ofthis shaft being arranged in the bearing 17. The shaft 25 is providedwith a head 26, the lower surface of which bears upon the upper surfaceof the flange 24 and cooperates therewith to form an oil sealthat'prevents objectionable leakage of lubricant from the chamber 21downwardly along the shaft 25. A gland 27 is fitted in the boss 22 forthe purpose of compressing the packing 28 which surrounds the shaft 25.The bushing 23, gland 27 and packing 28 thus form a stufiing box whichprevents leakage of .oil along the shaft 25. The gland 27 is adjustedand secured by means of the studs 29 and nuts 30.

A worm gear 31 is keyed to the shaft 25- and a ball thrust bearing 32 isarranged between the gear 31 and the upper end of the bearing 17 to takethe downward thrust.

The base 10' has formed integrally therewith the aligned bosses 33 and34 (see Fig. 4), these bosses being provided with openings to receivethe bearing members 35 and 36, respectively. The bearing member 35 isprovided with a flange which is secured .to the end of the boss 33 bybolts 37 and the 'bearin member 36 is provided with a flange 38 t t issecured to the boss 34 by bolts 39. A horizontal shaft 40 is supportedin thebearing members 35 and 36 and the latter is provided at its outerend with a stufling box 41 containing suitable packing 42 whichsurrounds the shaft 40 and prevents leakage of oil therealong. Thepacking 42 is compressed in the usual manner by means of the nut 43 andthe outer end of the shaft 40 carries a pulley 44 or other suitable formof earing by which the shaft 40 may be rotaterf The shaft 40 has acollar 45 thereon against which one end of the worm 46 abuts, theopposite end of the worm being engaged by a ring 47 between which andthe inner end of the bearing member 35 there is a ball thrust bearing48. The worm 46 meshes with the worm gear 31 so that the shaft 25 isdriven by the shaft 40.

The casing section 13 is in the form of a hollow disk containing achamber 49 which serves as the intake chamber of the pump and to whichthe refrigerant is supplied through an opening 50 in the boss 51 locatedon one side of the section 13. The upper surface of the section 13 ismachined off to a smooth finish and has arranged thereon the threehorizontal cylinders 52, 53 and 54. While I have shown three cylindersin my preferred form of the invention yet one or more may be used andwhen more than one are used they are symmetrically placed on the section13 and each is provided on its lower side with a trunnion 55 whichengages a suitable bearing 56. The section 13 has a central openin 57 inalign ment with the boss 20, and slightly larger than the head 26 of thecrank shaft for the purpose of permitting lubricant to flow rom one sideof .the section 13 to the other.

1 A crank pin 58, eccentrieally arranged on the head 26, projectsupwardly therefrom and has screw-threaded connection therewith, asindicated at 59, the threads of which are preferably so arranged thatthere is a tendenc for the pin to be tightened as the crank s aftrotates. Each of the cylinders 52, 53 and 54 has a plunger 60 thereinand these are provided with suitable packing rings 61 and have theirinner ends internally threaded, as indicated at 62. Heads 63, which areconnected with the crank pin 58, are screwed into the inner ends of theplungers 60 and secured by means of suitable dowels 64. As will be notedfrom Fig. 1, the head 63 on one of the plungers 60 has two arms 65 whichengage the crank pin 58, and the head 63 on another of the plungers hastwo arms 66 located between the arms 65 and engaging with the crank pin58. The other of the heads 63 has a singlearm 67 located between thearms 66. The cylinders 52, 53 and 54 each have an inlet port 68 and adischarge port 69, these ports being located in the vertical planethrough the axis of the cylinders. The upper wall of the casing section13 has elongated ports 70 (see Fig. 2), with which the ports 68cooperate during the suction stroke of the plungers so that the gaseswill be drawn from the chamber 49 into the cylinders. This arrangementof ports follows the well-known practice in oscillating engines andpumps and will be understood by those skilled in the art without furtherexplanation.

The upper sides of the cylinders 52, 53 and 54 have fiat, smoothlyfinished surfaces on which a floating plate 71 rests. This plate has atrunnion connection with each of the cylinders, as indicated at 72 inFig. 1, and these trunnion connections hold the plate in the positionshown in the drawings. The plate 71 has ports 73 with which the ports 69of the cylinders cooperate during the discharge stroke of the plungers.The upper surfaces of the cylinders are recessed around the trunnions72, as indicated at 74 in Fig. 1, for the purpose of facilitatingaccurate manufacture and in order to insure a more uniform wear of theparts due to the oscillation of the cylinders. However, I have found itadvisable to leave the small triangular bearing surfaces at the innercorners of the cylinders, as indicated at 75 in Fig. 2, and thesetriangular bearing surfaces are provided on the upper and lower surfacesof the cylinders.

The center of the plate 71 has a boss 76 on the upper side in whichthere is seated a spring 77, the upper end of this spring carrying theblock 78 on which bears the means of a cap 80 having a screw-threadedconnection with the boss 81. Since, in the operation of the pump, thecompressed gases are contained in the upper part of the casing section14 and have a tendency to leak out along the screw 79, I provide agasket 82 between the lower end of the ca 80 and the shoulder 83 for thepurpose of preventing leakage at this point. In order to stiffen theplate 79 it is provided with a circumferential flange 83 and radial ribs84. A boss 85 is arranged on the up )er part of the casing section 14and is preferably provided with an internally threaded opening 86 whichserves as an outlet for the compressed gases.

The interior of the casing formed by the sections 12, 13 and 14 isfilled with a suitable lubricating oil to approximately the levelindicated by the line 87 so that the cylinders 52, 53 and 54 with theirplungers. the crank pin 58 and the trunnions 55 and 72 are all submergedin the lubricant. The

upper surface of the late 71 is also sub-- merged so that all the portsthrough -which' the gases are led into and out of the dinarily fillsthese ports.

In the operation of the pump the shaft rotates the crankshaft 25 andthecrank pin 58 causes the plungers to reciprocate as well as oscillate,and the plungers, in turn, cause the cylinders to oscillate with them.The action-of the plungers and the movement of the cylinders opens andcloses the various ports so that the gases are drawn from the chamber 49and discharged into the space in the casing section 14 whence it passesout through the opening 86 with which a suitable pipe will be connected.In

case sulfur dioxide is used as the refrigerant and any of this gasliquefies after being discharged from the cylinders it will settlethrough the lubricant into the space 21 "in the casing section 12, andthe boss20 will prevent any of the liquid sulfur dioxide from leaking.out along the shaft 25 unless there should be such an accumulation ofthe li uid sulfur dioxide as to bring the level t ereof up to the lowersurface of the head 26 but ordinarily there would be no possibility ofsuch a large accumulation.

The housing of all of the moving parts, of

i the pump within the casing, as above described, avoids the possibilityof the escape of the refrigerant to the external atmosphere which wouldbe objectionable in many instances, if 'it occurred.

The chamber in the base 10 may be filled with lubricant to a point abovethe worm gear31 so that the latter will be thoroughly lubricated.

\Vhile I have illustrated and described what I now consider to be thepreferred formof my invention, it will be understood that changes in thedetails of construction may be made without departing from the spirit ofthe invention which is defined in the appended claims.

Having thus described my invention, what I claim is: v i

1. In apparatus of theclass'described, the combination of a casing,a-vertically arranged crankshaft therein, a horizontally arrangedoscillating cylinder in said casing, a plunger in said cylinderoperatively connected with said shaft to be actuated thereby, saidcasing being adapted to holda lubricant in which said cylinder andplunger are submerged, a member cooperating with the upper side of saidcylinder and having a port through which gases are discharged into saidlubricant, and said casing having an outlet for gases above the surfaceof the lubricant. 1

2. In apparatus of the class described, the

combination of a casing, a vertically arranged crankshaft therein, ahorizontally arran ed wall in said casing, an oscillating cylinderhaving a trunnion connection with said wall, said wall and said cylinderhaving cooperating surfaces and ports for controlling the flow of gasesto said cylinder, said casing being ad a ted to hold a lubricant inwhich said cylin er is submerged, a plunger in said 0 linder operativelyconnected with said she t to be actuated thereby, a member cooperatingwith the upper side of said cylinder and having a port through whichgases are discharged into said lubricant, and said casing having anoutlet for gases above the surface of the lubricant.

3. In apparatus of the class described, the combination of a casing, avertically arranged crankshaft therein, a horizontally arranged wall insaid casing, a plurality of oscillating cylinders each having a trunnionconnection with said wall, said wall and said-cylinders havingcooperating surfaces and ports for controlling the flow of gases intosaid cylinders, said casing being adapted to hold a lubricant in whichsaid cylinders are submerged, a plunger in each of said cylindersoperatively connected with said shaft to be actuated thereby, a memberbearing on the upper sides of said cylinders and having ports throughwhich gases are discharged into said lubricant, and said casing havingan outlet for gases above the surface of the lubricant.

- 4. In apparatus of the class described, the combination of a casing, avertically arranged crankshaft therein, a horizontally arranged wall insaid casing, a plurality of oscillating cylinders each having a trunnionconnection with said wall, said wall and said cylinders havingcooperating surfaces and ports for controlling the flow of gases, aplunger in each of said cylinders operatively connected with said shaftto be actuated thereby, and -a member bear-1n upon the upper sides ofsaid cylinders an having trunnion connection therewith, said member andsaid cylinders having cooperating ports for controlling the flow ofgases. 5. In apparatus of the class described, the combinatlon of acasing, said casing having a horizontally arranged wall, a verticallyar-- ranged crankshaft projecting upwardly through said wall and havinga crank thereabove, means below said wall for rotating said shaft, aplurality of oscillating cylinders each having a trunnion connectionwith said wall,'said wall and said cylinders having cooperating surfacesand ports for controlling the flow of gases, a plunger'in each of saidcylinders operatively connected with said shaft to be actuated thereby,a member bearing upon the upper s e of said.

cylinders and having trunnion connection therewith, said member and saidcylinders having cooperating ports for controlling the flow of gases,and pressure means for holding said member against'said cylinders andsaid cylinders against said wall.

6. In apparatus of the class described, the combination of a casingprovided with a horizontally arranged chambered wall, a verticallyarranged crankshaft projecting upwardly through said wall and having acrank thereabove, means below said wall for rotating said shaft, alurality of oscillating cylinders each hav1n a trunnion connection withsaid wall? said wall and said cylinders having cooperating surfaces andports for controlling the flow of gases between theichamloer in saidwall and the cylinders, a plunger in each of said cylinders operativelyconnected with said shaft to be actuated thereby, a floating plateresting upon said cylinders and having trunnion connection therewith,said plate and said cylinders having cooperating ports for controllingthe flow of gases, and adjustable pressure means on the upper side ofsaid plate for pressing the plate against said cylinders and thecylinders against said wa l.

7. In apparatus of the class described, the combination of a casingprovided with a horizontally arranged chambered partition therein spacedabove the bottom wall of the casing, said bottom wall being providedwith an upwardly projecting boss having a stufling-box therein, acrankshaft extending I through said stutlingbox and said partition andhaving a crank located above the partition, means below said bottom wallfor rotating said shaft, a plurality of oscillating cylinders resting onsaid partition and having trunnion connection therewith, a floatingplate resting on said cylinders and connected therewith by trunnions,means for pressing said plate against said cylinders,

said casing being adapted to contain a lubricant above and below saidpartition and in which saidcylinders are submerged so as to seal theengaging surfaces of said plate, said cylinders and said plate, aplunger in each cylinder operatively connected with said crank, saidplate having ports through which gases are discharged'into saidlubricant, and said casing having an outlet for gases above the surfaceof the lubricant.

8. In apparatus of the class described, the combination of a casingcomprising a plurality of superposed sections bolted together to providea pressure-tight chamber, the lower of said sections having an internalupwardly projecting boss having a stuflingbox therein, a sectionsupported on said lower section and having a chamber therein and anopening extending to the exterior and through which there iscommunication with said chamber, the last-mentioned section also havingan opening therethrough in substantial alignment with said boss, anupper section shaped to form a chamber above the last-mentioned sectionand having an opening to the exterior in the upper part thereof, avertical crankshaft extending through said stuffing-box and thesecondmentioned section and having'a crank located above the latter, aplurality of horizontally arranged cylinders locatedin the said chamberabove the second-mentioned section, plungers in said cylindersoperatively connected with said crank, and valve means associated withsaid cylinders for causing a fluid to flow from the chamber in thesecond-mentioned section through said cylinders and be discharged intothe chamber above the second-mentioned section.

In testimony whereof I aflix my signature.

LEE B. GREEN.

